工作流中ServiceTask的各种方法

      在工作流中的activiti的serviceTask几种方法：

 

模拟自动执行任务工作流的流程图：

 

 


 

 

工作流配置：

serviceTaskExpression.bpmn20.xml

Xml代码  


<?xml version="1.0" encoding="UTF-8"?>  

  

<definitions id="definitions"   

  xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"  

  xmlns:activiti="http://activiti.org/bpmn"  

  targetNamespace="Examples">  

    

  <process id="serviceTaskProcess">  

  <startEvent id="start"  />  

   <sequenceFlow id="flow1" sourceRef="start" targetRef="serviceTask" />  

     

   <!-- 调用委托类的依赖注入功能 -->  

    <serviceTask id="serviceTask" name="Java service invocation"    

      activiti:class="com.easyway.activiti.servicetask.ReverseStringsFieldInjected">   

          <extensionElements>   

            <activiti:field name="text1">   

              <activiti:expression>Welcome to Beijing</activiti:expression>   

            </activiti:field>   

            <activiti:field name="text2">   

               <activiti:expression>Hello Mr. Bai</activiti:expression>   

            </activiti:field>   

          </extensionElements>   

    </serviceTask>  

    

    <sequenceFlow id="flow2" sourceRef="serviceTask" targetRef="serviceTask1" />  

      

    <!-- 调用spring bean中的相关的委托bean -->  

    <serviceTask id="serviceTask1" activiti:delegateExpression="${delegateExpressionBean}" />  

      

      

      

     <sequenceFlow id="flow3" sourceRef="serviceTask1" targetRef="servicetask2" />  

       

       

     <!-- 调用spring bean中的方法 -->  

    <serviceTask id="servicetask2"    

             name="My Java Service Task"    

             activiti:expression="#{sentenceGenerator.getSentence()}" />  

   

    <sequenceFlow id="flow4" sourceRef="servicetask2" targetRef="servicetask3" />  

      

  <!-- 调用spring bean中的相关的委托bean -->  

    <serviceTask id="servicetask3"    

         name="Java service invocation"    

         activiti:class="com.easyway.activiti.servicetask.ToUppercase">   

        <extensionElements>   

          <activiti:field name="text" stringValue="Hello World" />   

        </extensionElements>              

    </serviceTask>       

  

    <sequenceFlow id="flow5" sourceRef="servicetask3" targetRef="endEvent" />  

    <endEvent id="endEvent" />  

  </process>  

  

</definitions>  

 

工作流的实现：

Java代码  


package com.easyway.activiti.servicetask;  

  

import org.activiti.engine.delegate.DelegateExecution;  

  

/** 

 * 从配置文件注入多个属性类型必须为Expression 

 * @author longgangbai 

 *  

 * 2011-12-20  下午10:08:01 

 */  

public class ReverseStringsFieldInjected implements JavaDelegate {   

       

      private Expression text1;   

      private Expression text2;   

       

      public void execute(DelegateExecution execution) {   

        String value1 = (String) text1.getValue(execution);   

        execution.setVariable("var1", new StringBuffer(value1).reverse().toString());   

       

        String value2 = (String) text2.getValue(execution);   

        execution.setVariable("var2", new StringBuffer(value2).reverse().toString());   

      }   

    }  

 

 

Java代码  


package com.easyway.activiti.servicetask;  

  

import org.activiti.engine.delegate.DelegateExecution;  

  

/** 

 *  从配置文件注入一个字符串用于变为写 

 * @author longgangbai 

 *  

 * 2011-12-20  下午09:56:59 

 */  

public class ToUppercase implements JavaDelegate {   

      private Expression text;   

      public void execute(DelegateExecution execution) throws Exception {   

          String value1 = (String) text.getValue(execution);   

           execution.setVariable("input", value1);   

      }   

         

    }  

 

 

servicetaskSpringTest-context.xml

Xml代码  


<?xml version="1.0" encoding="UTF-8"?>  

  

<beans xmlns="http://www.springframework.org/schema/beans"   

       xmlns:context="http://www.springframework.org/schema/context"  

       xmlns:tx="http://www.springframework.org/schema/tx"  

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  

       xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans.xsd  

                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd  

                           http://www.springframework.org/schema/tx      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">  

  

  <bean id="sentenceGenerator" class="com.easyway.activiti.servicetask.SentenceGenerator" />  

    

  <bean id="delegateExpressionBean" class="com.easyway.activiti.servicetask.DelegateExpressionBean">  

    <property name="sentenceGenerator"  ref="sentenceGenerator" />  

  </bean>  

    

  <bean id="sentenceToUpperCaseBean" class="com.easyway.activiti.servicetask.SentenceToUpperCaseBean">  

    <property name="sentenceGenerator" ref="sentenceGenerator" />  

  </bean>  

    

  <bean id="myExecutionListenerBean" class="com.easyway.activiti.servicetask.ActivitiExecutionListenerBean" />  

  <bean id="myTaskListener" class="com.easyway.activiti.servicetask.ActivitiTaskListener" />  

    

  <bean id="myTaskListenerBean" class="com.easyway.activiti.servicetask.ActivitiTaskListenerBean" />  

  

  <bean id="dataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">  

    <property name="driverClass" value="org.h2.Driver" />  

    <property name="url" value="jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000" />  

    <property name="username" value="sa" />  

    <property name="password" value="" />  

  </bean>  

  

  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  

    <property name="dataSource" ref="dataSource" />  

  </bean>  

    

  <bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">  

    <property name="dataSource" ref="dataSource" />  

    <property name="transactionManager" ref="transactionManager" />  

    <property name="databaseSchemaUpdate" value="create-drop" />  

    <property name="jobExecutorActivate" value="false" />  

  </bean>  

    

  <bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">  

    <property name="processEngineConfiguration" ref="processEngineConfiguration" />  

  </bean>  

    

  <bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />  

  <bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService" />  

  <bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />  

  <bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService" />  

  <bean id="managementService" factory-bean="processEngine" factory-method="getManagementService" />  

  

</beans>  

 

 

测试类：

Java代码  


package com.easyway.activiti.servicetask;  

  

import org.activiti.engine.runtime.ProcessInstance;  

import org.activiti.engine.test.Deployment;  

import org.activiti.spring.impl.test.SpringActivitiTestCase;  

import org.springframework.test.context.ContextConfiguration;  

  

/** 

 * 工作流中ServiceTask的各种方法 

 * 1.通过activiti:class使用相关的javaDelegate的子类。 

 *    <serviceTask id="serviceTask" name="Java service invocation"   

      activiti:class="com.easyway.activiti.servicetask.ReverseStringsFieldInjected">  

          <extensionElements>  

            <activiti:field name="text1">  

              <activiti:expression>Welcome to Beijing</activiti:expression>  

            </activiti:field>  

            <activiti:field name="text2">  

               <activiti:expression>Hello Mr. Bai</activiti:expression>  

            </activiti:field>  

          </extensionElements>  

    </serviceTask> 

    2.通过spring的使用委派表达式实现 

      <serviceTask id="serviceTask1" activiti:delegateExpression="${delegateExpressionBean}" /> 

    3.通过表达式将实现 

        <serviceTask id="servicetask2"   

             name="My Java Service Task"   

             activiti:expression="#{sentenceGenerator.getSentence()}" /> 

     

    4.通过activiti:class注入相关的属性 

        <serviceTask id="servicetask3"   

         name="Java service invocation"   

         activiti:class="com.easyway.activiti.servicetask.ToUppercase">  

        <extensionElements>  

          <activiti:field name="text" stringValue="Hello World" />  

        </extensionElements>             

    </serviceTask>     

 * @author longgangbai 

 *  

 * 2011-12-20  下午09:29:23 

 */  

@ContextConfiguration("classpath:servicetaskSpringTest-context.xml")  

public class ServiceTaskExpressionTest extends SpringActivitiTestCase {  

    

  @Deployment(resources={"diagrams/serviceTaskExpression.bpmn20.xml"})  

  public void testDelegateExpression() {  

    ProcessInstance procInst = runtimeService.startProcessInstanceByKey("serviceTaskProcess");  

    assertEquals(true,procInst.isEnded());  

  }  

  

}